Extension-ladder



(No Model.) 7 Q i 2 Sheets-Sheet 1. J. ROYDS.

EXTENSION LADDER. No. 333,784. r Patented Jan. 5, 1886.

INVE NTOR 'WITNESSES:

N PETERS. Pholo-Llflmgnphur. Wiihingon. 04 C.

(No Model.) 2 Sheet-Sheet 2.

- J. ROYDS;

I EXTENSION LADDER. N0. 333,784. Patented Jan. 5, 1886.

s 0 a o 0 INVENTOR I I a? a a) N. PETERS. Phnm-Lflbu m hur. Walhinglnn. 11c.

WlTNESSES:

UNITED STATES PATENT OF ICE.

JOHN ROYDS, OF CHESTER, PENNSYLVANIA.

EXTENSION-LADDER.

EPECIIE'ICATION forming part of Letters Patent No. 333,784, dated January 5, 1886. Application filed November 23 1885. Serial No. 183,611. (No model.)

.To all whom it may concern.-

Be it known that 1, JOHN Horns, acitizen of the United States, residing in Chester, Delaware county, Pennsylvania, have invented a new and useful Improvement in Extension- Ladders, of which invention the following is a specification.

1n the annexed drawings, Figure l is a front elevation of the ladder extended and resting on a turn-table, whichis intended to be mounted on a truck. Fig. 2 is a side elevation of the same, the several sections or divisions of the ladder, in a closed condition, being shown by dotted lines in an upright position and by solid lines in the position held .by them when lowered preparatory to a change in the location of the truck. Fig. 3 is a plan detail of the device employed for raising the closed sections into the upright position. Fig. 4 is a transverse section of the closed ladder on the line 50 a: in Fig. 2. Fig. 5 is a transverse section of a rung.

a and a, a and a a and a are the side bars, which I prefer to make light of angleiron,as shown. I make the rungsb of piping, and cover them with cord,tarred rope,or other material affording a good foot-hold.

0 represents a turn-table of ordinary construction.

d and d are metallic base-plates fastened to the turn-table c.

e is a shaft, which has hearings in plates d and d.

f is a ratchet on one end of shaft e, and g is a pawl.

h and i are arms rigidly attached to the shaft 6.

j is a connecting-bar.

k and k are anti-friction pulleys.

Z is a lever rigidly attached to the opposite end of shaft 6.

mis ashaft or drum having bearings in plates (1 and d, and turned by the crank it.

o is a chain connecting the extremity of the lever Zwith the drum m.

p is a crank-shaft or drum with bearings in plates (1 and d, and provided with the ratchet q. r is a pawl.

s and s are anti-friction rollers. 25 t t are anti-friction pulleys, and u u a are clevises turning on the top rungs of the respective sections, except the topmost section, where they are unnecessary.

'v is a chain, one end of which is attached to the shaft 1), its other end being passed over the pulley t and made fast to the bottom rung of the second section.

22 is another chain, one end of which is attached to the clevis it, its other end being passed over the pulley t and made fast to the bottom rung of the third section.

12 is another chain, one end of which is at tached to the clevis it, its other end being passed over the pulley t and made fast to the bottom rung of the fourth section.

It is desirable that the top rung of the topmost section should be provided with an eye, w, which affords means for the easy attachment of hose preparatory to the extension or elevation of the ladder, when necessary.

The drawings representa ladder of four sections; but it is to be understood that any required number of sections may be employed.

It will be seen that the breadth of the side bars of the individual sections and the breadth of the respective sections diminish sufficiently to allow the second section, when let down, to slide into a cage formed by the rungs, and the side bars and flanges of the bottom section, and the third section to slide in like manner into the second section between the rungs and the side bars and flanges of this section, and so on in respect to all the sections employed.

The shaft 1) passes through the side bars, a and a, and turns freely in them, while it attaches them to the plates d and d.

When the several sections of the ladder are in aclosed condition, and it is desired to extend them, they are first raised to the desired angle of elevation by turning the shaft aiflwhich, through chain 0 and lever 1, causes arms hand to elevate the closed sections into the upright position indicated by the dotted lines in Fig. 2, or into any other required position of less elevation. The arms h and t make this operation an easy one. The sections of the ladder are then extended by turning the crank-shaft p, which winds up the chain 0, and thus raises the second section, which at the same time, by means of the chain c, raises the third section, and this, by means of the chain 22, raises the fourth or top section, all the movable sections reaching their greatest points of elevation, respectively, at the same time. When the lad der has been raised to the desired angle of elevation, it is held in that position by means of the ratchet f and pawl g, and when the several sections have been extended partly or wholly they are held in their extended positions by means of the ratchet q and pawl o".

I claim 1. In combination with the telescoping sections of an extension-ladder, the described means of raising the same when in a closed condition from the prostrate to the upright position-to wit, arms h and t, rigidly attached to a shaft, 6, the lever Z, also rigidly attached to said shaft e, the chain 0, the crank-shaftm,l and base-plates d dsubstantially as set forth.

2. An extensionladder consisting of a fixed section and one or more movable sections,

which consist, respectively, of flanged side bars, such as a and a, and which are pro- I vided, respectively, with rungs arranged to form one side of a cage,while the side bars and their flanges form the opposite side of said cage, into which the movable section next in the series telescopes, substantially as set forth.

3. The combination of arms h and z, shaft 6, lever Z, chain 0, shaft m, base-plates d d, the fixed section of the ladder, and one or more movable sections, the latter being connected by chains directly or mediately to the crankshaft '9, whereby they are simultaneously raised, said movable sections being adapted to telescope into said fixed section, substantially as set forth.

JOHN ROYDS.

Vitnesses:

J. E. SHAW, P. A. FENIMORE. 

